IQ testing

Simon, a 16-year-old male, has always performed adequately in school. This semester his math scores dropped from Bs to Fs, but his other grades have remained Bs. IQ testing with the WAIS-IV revealed that he has an average overall IQ without any major deficiencies. Do these normal findings provide useful diagnostic information? How so? What might be happening with Simon?

minimum 150 words and at least 1 in-text citation